I have hit a roadblock at an IAT of 160* with my roots blower @8 lbs of boost. Any more boost and the ET starts dropping off and the IAT goes up. From what I've read W/M injection will lower the IAT by 50 to 60 *.I would like more than that as 10 lbs of boost is 220*. I would like some opinions on using nitrous to cool the charge as it come out of the bottle at -130 *.I have installed the extra long injectors into the spacer plate, one in each spacer plate pointing right into the blower rotor.
Has anyone tried using NOS to intercool and how much of a drop could I expect with NOS?

Time for a bigger blower?

Kevin

I don't know much about roots style blowers, but could you run some type of intercooler like a normal turbo setup or procharger? on the other hand a larger blower might help as well. I am interested on the reply's on this one. On engine masters this last week they did intercooler with turbos, and it did help out a bunch, just thinking this could help you.

You may need the blower serviced, Have you had that done lately? Valve springs? There was a test done on yt with NOS and the gain was the same as the NOS kit size.

I've never had a blown combo, but from what I've seen others go through...I'd absolutely go E-85.

I bought a blower motor off a friend last year. Its a 440/450 8:1 motor that ran an 8-71 on it. He ran as much as 22lbs of boost on it. I don't have it running yet, but he ran it on E85 and loved it. I got the carbs and fuel system with it as well. Just not the blower and intake.

Not sure if I am going to run a roots on it, or go Procharger at this point yet. When I priced a roots, they told me they build to order based on the fuel. M1 uses tightest tolerance and makes the most boost, E85 uses a little more clearance....And gas uses the most clearance and creates the least boost. What is your blower setup for?

I know you drive it.....So I would run gas on the street, and E85 at the track....Which if your running carbs, can be an issue...Which brings us to where you are trying to cool IAT's with carbs on gas....Meth is the way, how to get there I guess there are different kits. Long as you kick it in when it gets up in boost...So a couple of nitrous plates and a pump and meth tank and a boost pressure switch......

I will mention a whipple 8.3L will make a lot less heat on gas.

I'm at 545 inches with a stage 3 1071. Have not restriped the blower bacause I'm 90% street. At the track on a hot day the best has been 9.3x @ 138 with 8 lbs. Using 2 SV1 carbs and prefer to stay on gas due to availability of E and would also have to change the entire fuel system. If I could just lower the IAT's it should slide right into the 8's.
I figure I will start with a 50 shot under each carb and see what happens. There must be someone that used nitrous to cool the charge with a few hundred HP as a by product.

Not a boost guy, but I've heard of it being done. Turbos as well.

Most drag race stuff limits you to one power adder. Might have been tractor pulling circles where I read about it.

Have you thought about using a Snow water met injection system to help cool the IAT down? If not maybe you should

Cab,from hat I've been able to read ,W/M will lower the IAT upwards to 60*.The ideal IAT is 135* and mine go over 200*. With NOS coming out the bottle at minus 130* I would hope to lower my IAT by 80* or so.The HP byproduct does not hurt either!

Anything combustible (gas, M100, nitrous) in a Roots system is a bomb waiting for that hung exhaust valve, backfire etc. Seen the pix of blowers going 300 feet in the air?
Turbos & centrifugals can boost only air with fuel added at the throttle body.

Look at the discharge (lower) port of a Kobelco etc. blower.
In place of the rectangular port your blower has (full length & full width of the blower case), the serious versions have a much smaller, almost triangular* port placed at the extreme forward end of the manifold.
All Eaton "M" series blowers have this.
This mod, alone, reduces IAT.

* Closest shape is a NACA submerged duct

You can check the blower case to rotor clearence yourself by getting a .010 brass long feeler and put it between the rotors with the carbs off and check the rotor to case also with a long bar [1/2"] drive on the snout.

Nitrous will drop the temp a bunch due to the big pressure drop. You should spend some time on the phone with a nitrous expert and have them walk you thru what you'll need to do to get maximum benefit of both cooling, and power gains from nitrous. They might have a special setup for the blower. I know that I've seen turbo setups with a ring of small ports.

Problem solved and how we did it in the early 2000's to get one into the bottom 8's

https://www.holley.com/products/nitrous/service_replacement_parts/parts/13350-CBNOS

Poly; I know I'm playing in the danger zone and only intend on 50hp or so under each carb.
Mike; The strips wear a certain amount and that's it. Restriping is for the hard core racer looking for every ounce of boost. I'm a streeter with 3 or 4 track days if it's in the budget.
Andy; I will to a few nitrous companies. I figured I would ask here as there is vast Knowlege here.
Al;$1800 is NOT in the budget which is why I used two fogger nozzles for a baby shot.That octopus you pointed out is for a huge amount of juice!

Been down this road and that "octopus" does a MUCH better job of accomplishing what you are after with great results. It will give you as much or as little as you need, but it distributes that much more evenly and better IMO. We tried plates as well with mixed results. Once we wen that way the street driven 8-71 small block it was on was driven to and from the track and able to run bottom 8's at will and this was in the early 2000's..

I agree about the strips self clearence and that is it.When I had my blower serviced .009 is what I had the set it at but I also got new bearings so you may want to think about that. That NOS plate sure is nice but all said n done it may be close to 3k with a bottle,solinoid,tax,shipping or very close to that.Good luck figuring out what you want to do I know it aint easy.Be safe!

Found these:

https://prometh.com/collections/car...anol-injection-plate?variant=13168995331

https://prometh.com/collections/car...nol-injection-plates?variant=13195452995

both of those links say "sold out".

I know...Getting parts for anything right now is hit or miss...Look at tires for racing, just to see how bad it is.